Blog

Which is not a risk factor for melanoma?

A 0.60 g sample of sodium salicylate was dissolved and diluted to a final volume of 250 mL with deionized water. What is the concentration of this solution?  MM (Sodium salicylate) = 160.11 g/mol

Silver nitrate reacts with copper leading to the formation of copper (II) nitrate and silver as per the chemical equation shown below:   2AgNO3                 +            Cu                  =          Cu(NO3)2 +      2Ag 169.89 g/mol              63.55 g/mol How many grams of copper are needed for 154 g of silver nitrate to react completely?

How much time in minutes is required to administer 300 mL of glucose IV solution if the flow rate is 10 mL/ hr?

A CHEM1045 student prepares a dilute solution of sodium hydroxide, starting with 6M sodium hydroxide. She then titrates a 1.772 g sample of KHP with the dilute 6M sodium hydroxide solution, to a phenolphthalein end point. If the titration required 22.84 mL of sodium hydroxide calculate the concentration of the sodium hydroxide solution.  MM (KHP) = 204.22 g/mol

Explain the difference between the end point and the equivalence point in a titration.

What is the pressure of an 8.5 L cylinder filled with 33.5 g of nitrogen gas at a temperature of 298 K ?  MM (N) = 14.01 g/mol R = 0.0820574 L•atm•mol-1K-1

A student did an experiment to determine the percent composition of a sulfide of copper. He found that 0.335 g of copper combined with excess sulfur when heated to give a mass of copper sulfide of 0.454g. What is the percent of copper in the compound?

What is the empirical formula of dinitrogen pentoxide?

If ice is placed in a vacuum chamber, the water molecules go directly from the solid state to the gaseous state without ever being in a liquid form. This process is sometimes referred to as “freeze drying”. It can also be called: